Furnace grate



Sept. 20, 1927.

W. L. HARRISON ET AL FURNACE GRATE Filed Dec. 8, 1926 v 14012 'ntoQ is on v 6H0: W011 Patented Sept. 20, 1927.

UNITED" STATES Parent Fries.

WALTER L. HARRISON AND CHARLES W.

HARRISON, 0,]? SHELBINA, MISSOURI, AS-

SIGNORS OF ONE-THIRD T0 J. 0., DELONEY, QF MQNROE CITY, MISSOURI.

FURNACE GRATE. f i

Application filed December 8, 1926. Serial No. 153,346.

This invention relates to newand useful improvements in grates, and particularly to dumping grates.

One object of the present invention is to provide a grate wherein the grate bars are connected in groups for unitary rocking movement, whereby to permit dumping a portion of the fire.

Another object is to provide a grate of this character wherein the grate bars engage each other to prevent passage of air therebetween.

Another object is to provide a grate wherein the bars are hollow and provided with perforations to permit air being directed against the low-er side of the fire.

Another object is to provide a grate wherein the bars are hollow, and means provided with forcing air thereinto, from the ends thereof.

Other objects and advantages will be apparent from the following description when taken in connection with the accompanyin drawings.

In the drawings:

Figure 1 is a vertical sectional view taken longitudinally of the grate bars, and throughthe supports for the ends thereof, the grate bar being in elevation.

Figure 2 is a vertical transverse sectional view on the line 2-2 of Figure 1.

Figure 3 is a top plan View of several of the grate bars, showing the perforations thereof.

Figure 4; is a vertical longitudinal central sectional view through one of the grate bars, and the valve for controlling the air to the interior thereof, the valve being shown in open position.

Referring particularly to the accompanying drawing, 10 represents the side walls of the ash-pit of a furnace, in connection with which the present grate is used. Secured to the side walls arethe grate bar supports 12, which carry the brackets 11, and on which brackets are disposed the obtuse angular plates 13, said plates extending transversely of the ends of the grate bars 14. Each of the grate bars 14 is hollow, as clearly seen in the sectional views, and has on one end, the pintle 15, which rests in one of the notches 12, of the support 12, while said bar has on its other end a hollow stem 16, resting in a similar notch 12, in the support 12. at the other side of the ash-pit.

It will be noted that the lower, or inner portionof the incline of the plate 18 is dis posed below the upper fiat face of the grate bar 14. The, bars 14 are curved, transversely on their lower sides, such curves being so formed that one longer edge of the bar is at one sideofthelongitudinal central axis of the bar, whereby to cause the bar to rock in that direction, by reason of the added weight thereat. Upon reference to Figure 2, it will be seen that the bars are arranged in two groups, and that each of the bars is formed with a centrally arranged, and downwardly extending arm 17, and that links 18 and 19 pivotally connect the arms of the respective groups, so that all the bars of a group may be rocked simultaneously, whereby one portion of the fire may be dumped without disturbing the other portion, such links being adapted to be operated by any suitable and well known means externally of the furnace. The upper corner of the deeper side of each of the grate bars is cut off, as shown at 20 which is arranged to engage with a longitudinal rib 21, formed on the other edge of the next adjacentbar, for the purpose of preventing rocking movement of the bars in that direction, beyond their proper normal level position. The upper face of each of the grate bars is flat, and is provided with the perforations 22, through which air escapes to the fire. Extending longitudinally between the innermost of the grate bars of each group is a bar or rod 23, against which the adjacent edge portions of said bars engage whereby to form a practically airtight 'oint.

1 The hollow stem 16 is externally threaded to receive the packing nut 24, which confines the packing 25, to prevent escape of air between the stem and the air pipe 28, which is slipped into said stem. The air pipe 26 is connected with any suitable source of compressed air to be fed to the interiors of the grate bars. In the air pipe 26 there is mounted a butterfly valve 27 operable by a radial arm 28. It is to be understood that each grate bar is equipped with a valve 27, and that the valve arms 28, of all of the valves of a group of grate bars are connected by a link 29, and that such link is operable from the exterior of the furnace, in any suitable manner. In one end of each of the grate bars there is mounted a clean-out plug 30, which permits access to the interior of the grate bar, for the purpose of cleaning out the ashes which have fallen through the perforations. The peripheral face of the packing nut 24; is formed with a series of notches 31 with which is adapted to be engaged a pivoted. detent 32, mounted on the hollow stem 16, whereby to prevent relative rotary movement of the stem'and the said nut, and thereby permit said stem to rotate on the air pipe 26.

lVhat is claimed is: a

The combination with a hollow grate bar having a hollow stem extending from one end thereof, and the side wall-of a furnace, of a notched support mounted on said Wall and receiving the said stem in the notch thereof for rocking movement, a valved air nipple disposed 1n the outer end of sa1d stein,

a packing element on the nipple and bearing i1 and a detent movably mounted on the stem and interchangeably engageable in the said notches for holding the nut against rotation independently of the stem. In testimony whereof we affix our signatures.

WALTER L. HARRISON. CHARLES W. HARRISON. 

